isotopes; ions and ionic bonds

isotopes

atoms of the same element that have the same number of protons but different numbers of neutrons

subatomic particle question

number of protons = 16

number of neutrons = 20

number of electrons = 16+2 = 18

2- charge means it gained electrons

relative atomic mass question

(6×10)+(7×90)=690

690/100=6.9

relative atomic mass formula

relative abundance always equals 100%

hydrated ion

a substance that is chemically combined with water

ionic compound properties

• high melting/boililng point

• cannot conduct electricity when solid (because theres no mobile ions to carry charge)

  • can conduct electricity in molten/aqueouss state

negative charge

missing electrons to make a full outer shell

positive charge

extra electrons preventing it from having a full outer shell

ionic bonding

a strong electrostatic attraction between oppositely charged ions

ionic bond question

why ions have a high melting/boiling point

there are strong bonds and a stable lattice structure that requires lots of energy to break apart

dot-and-cross diagram question